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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb72dafb861fd6ff39a08b9d6241f7a82fc005164cc096885a92554bb2aaac0e' 
  AND token = '+KCVnUcJ5MYDs5bDhL1cpoLMC8TkKyaEoJpi9MNsRc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}